Stephen Smith created GROOVY-10223:
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Summary: Add support for Optional to
DefaultTypeTransformation.asCollection()
Key: GROOVY-10223
URL: https://issues.apache.org/jira/browse/GROOVY-10223
Project: Groovy
Issue Type: New Feature
Components: groovy-jdk
Reporter: Stephen Smith
The JDK recently added support for *Optional::stream()* which returns a stream
containing either the unwrapped value or an empty stream if the *Optional* is
empty.
In the groovy-jdk, using iteration however will call
{noformat}
DefaultTypeTransformation.asCollection(){noformat}
which does not specifically check for type *Optional*, instead it will just
wrap the *Optional* itself in a *List* rather than the unwrapped value as the
default behavior.
Adding an _if else_ clause will allow using the Optional as either a single or
empty list.
{code:java}
if (value instanceOf Optional) {
return ((Optional)value).map(List::of).orElse(List.of()
}{code}
Alternatively, add an *asList()* to the Optional class.
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